This is a document with the general information about your four options: Poland, Slovakia, Moldova and Hungary:

You can get information on the waiting times at each border here:

In general, unless you have someone you trust waiting for you at the border, the best course of action is to get transportation for one of the welcoming shelters.

The official shelters will be well organised and will have on spot the local Police controlling your entry. DO NOT board transport that is not clear to you is from an official shelter!!